EP0320763A1 - Procédé de traitement thermique de métaux - Google Patents

Procédé de traitement thermique de métaux Download PDF

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Publication number
EP0320763A1
EP0320763A1 EP88120403A EP88120403A EP0320763A1 EP 0320763 A1 EP0320763 A1 EP 0320763A1 EP 88120403 A EP88120403 A EP 88120403A EP 88120403 A EP88120403 A EP 88120403A EP 0320763 A1 EP0320763 A1 EP 0320763A1
Authority
EP
European Patent Office
Prior art keywords
gas
gases
heat treatment
oxygen
protective gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP88120403A
Other languages
German (de)
English (en)
Inventor
Reinhard Dipl.-Ing. Strigl
Andreas Dipl.-Ing. Dey
Thomas Dipl.-Ing. Kamm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Linde GmbH
Original Assignee
Linde GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Linde GmbH filed Critical Linde GmbH
Publication of EP0320763A1 publication Critical patent/EP0320763A1/fr
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/76—Adjusting the composition of the atmosphere

Definitions

  • Heat treatments of metals in furnaces are usually carried out under a protective gas atmosphere at temperatures of around 500 to 1200 ° C, with the high temperatures often being generated with gas burners. Both the used shielding gas and the exhaust gases from the heating burner are usually discharged unused today. From an economic point of view, this is not necessarily sensible and, above all, not environmentally friendly.
  • a further problem in the heat treatment of metals is that special high-quality protective gases, e.g. with very low CO2 and H2O proportions are necessary, e.g. with carbon neutral annealing.
  • This requirement can be met with a gas generator or a retort in the furnace that generates protective gas, e.g. a catalyst insert, possibly not accessible, so that the protective gas generated must be subjected to a preliminary cleaning before being introduced into the furnace. So far, this has only been possible with very expensive MEA washing systems or molecular sieve devices.
  • the object of the present invention is therefore to provide an economical and effective method for cleaning exhaust gases and other contaminated process gases.
  • This object is achieved in that at least some of the exhaust gases and / or the contaminated process gases are cooled by direct and / or indirect heat exchange with at least one of the starting gases present in liquefied form in such a way that the contaminants contained therein condense or freeze out and the condensed or frozen impurities are separated from the product gas thus generated.
  • the method described is particularly advantageous since a process gas which is kept in liquefied form, as is the case with many heat treatment methods, serves to solve an additional task.
  • the latent heat or cold necessary for gasification of the liquid gas is used, which is simple in known methods is removed from the environment, ie remains unused, in order to achieve the cleaning of a gas which also occurs in the process, for example heating burner exhaust gases or used protective gas, via condensation and freezing out of undesired substances.
  • carbon dioxide, water vapor and hydrocarbons are "filtered out".
  • the process thus delivers an exhaust gas that meets today's environmental protection requirements or, if applicable, a reusable product gas.
  • At least part of the cleaned gas is used for the ongoing heat treatment.
  • the gases to be cleaned are sucked in with the aid of at least one injector, in which the liquid gas is injected to produce the water jet pump effect, and brought into direct contact with the liquid gas.
  • an independent pump unit can be dispensed with and rapid cooling, condensation and freezing are achieved through direct contact between the liquid gas and the gas to be cleaned.
  • This procedure enables continuous process control with simple removal of the accumulated impurities during the regeneration time of a separator.
  • Claims 5 to 8 contain process variants in which the method according to the invention is used particularly advantageously or particularly advantageous refinements in special applications.
  • FIG. 1 shows the use of the method according to the invention for cleaning and treating the exhaust gas from the heating burner in a heat treatment device.
  • the exhaust gas coming from a heating burner 1 from a heat treatment furnace 2 is passed through a precooler 3 by the effect of a Liquid jet injector 4 having a water jet pump is sucked in and transported further into one of two separators 5, 6 arranged in parallel.
  • separator 5 is connected as a separator, whereas separator 6 is in the regeneration state.
  • the separator 5 connected as a filter is cooled with liquid nitrogen, so that pollutants condense and freeze therein or remain condensed and frozen out.
  • a largely impurity-free product gas leaves it, which can be released into the atmosphere without any problems, or at least partially can be used in a mixing unit 7 to form protective gas with suitable admixture of further starting gases or alcohols, for example nitrogen or hydrogen or methanol or ethanol.
  • the liquid nitrogen used for cooling which is then in the gaseous state, is fed into the supply of gaseous nitrogen and is thus actually used.
  • the separator 6 switched for regeneration is meanwhile "thawed" and the accumulated pollutants are discharged in liquid form or driven out in gaseous form with a low gas flow and appropriately disposed of.
  • FIG. 2 shows a diagram for the production of high-purity protective gas which is generated with a retort 9 lying in the heat treatment furnace 2 and which is pre-cleaned before it is actually fed into the furnace 2.
  • the protective gas containing slightly impurities is suctioned off after its synthesis in the retort 2 and then, as described in the previous exemplary embodiment, cleaned, any dilution with nitrogen being possible on the one hand by the injector and on the other hand by adding gaseous nitrogen in another way.
  • This product gas is then fed to the furnace 2 as a high-purity protective gas.
  • the protective gas can be subjected to such cleaning immediately after generation in the generator.
  • exhaust gas cleaning and reuse can of course also be carried out.
  • the method according to the invention e.g. the exploitation of the latent heat of the liquefied gas on the one hand and on the other hand the production of gaseous gas from liquefied gas as well as the provision of reusable gas from exhaust gas or spent shielding gas, a process that is both economical because of the economical use of starting gases and environmentally friendly because of the low level of pollution represents.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treating Waste Gases (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
EP88120403A 1987-12-16 1988-12-07 Procédé de traitement thermique de métaux Ceased EP0320763A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873742685 DE3742685A1 (de) 1987-12-16 1987-12-16 Verfahren zur waermebehandlung von metallen
DE3742685 1987-12-16

Publications (1)

Publication Number Publication Date
EP0320763A1 true EP0320763A1 (fr) 1989-06-21

Family

ID=6342771

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88120403A Ceased EP0320763A1 (fr) 1987-12-16 1988-12-07 Procédé de traitement thermique de métaux

Country Status (2)

Country Link
EP (1) EP0320763A1 (fr)
DE (1) DE3742685A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995011999A1 (fr) * 1993-10-28 1995-05-04 Loi Thermoprocess Gmbh Procede de recuit d'un produit a recuire et four associe
EP1338658A3 (fr) * 2002-02-26 2005-01-12 Westfalen Ag Procédé et dispositif pour le traitement termique de pièces
EP2218803A1 (fr) * 2009-02-12 2010-08-18 Linde AG Dispositif et procédé destinés à la carburation d'acier

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4125216A1 (de) * 1991-07-30 1993-02-04 Linde Ag Vorrichtung zur reinigung oder auch aufbereitung von gasen
DE4125215A1 (de) * 1991-07-30 1993-02-04 Linde Ag Verfahren zur reinigung oder auch aufbereitung von gasen
DE4318400C1 (de) * 1993-06-03 1994-06-23 Loi Ind Ofenanlagen Verfahren und Vorrichtung zum Wärmebehandeln von Werkstücken

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2082634A (en) * 1980-08-13 1982-03-10 Boc Ltd Heat treatment method
DE3104280A1 (de) * 1981-02-07 1982-08-12 Daimler-Benz Ag, 7000 Stuttgart Verfahren zur erzeugung von schutzgas aus dem abgas von strahlrohrbeheizten oefen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2082634A (en) * 1980-08-13 1982-03-10 Boc Ltd Heat treatment method
DE3104280A1 (de) * 1981-02-07 1982-08-12 Daimler-Benz Ag, 7000 Stuttgart Verfahren zur erzeugung von schutzgas aus dem abgas von strahlrohrbeheizten oefen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 8, Nr. 138 (C-231)[1575], 27. Juni 1984; & JP-A-59 047 321 (MARUZEN ENGINEERING K.K.) 17-03-1984 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995011999A1 (fr) * 1993-10-28 1995-05-04 Loi Thermoprocess Gmbh Procede de recuit d'un produit a recuire et four associe
EP1338658A3 (fr) * 2002-02-26 2005-01-12 Westfalen Ag Procédé et dispositif pour le traitement termique de pièces
EP2218803A1 (fr) * 2009-02-12 2010-08-18 Linde AG Dispositif et procédé destinés à la carburation d'acier

Also Published As

Publication number Publication date
DE3742685A1 (de) 1989-07-13

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